nah, british children's tv in the 70s was filled with sly innuendo (captain pugwash - "master bates" and all of the drug references in magic roundabout etc), but the point was it was subtle, and relied on you being an insider to get the joke. that twangers and balls stuff is way too obvious and even the stuffy old duffers who ran the beeb at the time would have caught on to that, where they were missing all of the magic mushroom stuff.
that's why i say fake
ps i was born in 69 so i grew up watching all of this stuff